论文部分内容阅读
与生长地层类似,在活动褶皱生长发育过程中形成的河流阶地堆积、阶地面与褶皱陡坎记录了褶皱发育的详细过程,其基本几何结构主要受控于下伏褶皱生长的机制与类型。文中讨论了简单膝折带迁移(恒定翼间角)生长断弯褶皱与断展褶皱、翼旋转(恒定翼长)滑脱褶皱、膝折带迁移滑脱褶皱、膝折带迁移-翼旋转联合作用以及弧形弯曲枢纽膝折带迁移褶皱作用下河流阶地的几何结构以及阶地面与下伏基座岩层间的角度关系,提出了这几类褶皱生长与河流阶地相互关系的运动学模型,同时考虑了河流加积和下切侵蚀作用对河流阶地最终几何结构的影响。在这些模型中,变形河流阶地和褶皱陡坎的基本几何结构既具有相似之处,也有截然不同之处。因此,通过对河流阶地和褶皱陡坎的细致填图、测量和测年,不仅可推断其下伏活动褶皱的生长变形机制,而且可以估算褶皱的隆升速率和控制褶皱生长的断层的滑动速率。
Similar to the growth stratum, the river terraces, step terraces and fluvial hurdles formed during the active folds record the detailed process of fold development. The basic geometric structure is mainly controlled by the mechanism and type of underlying folds. In the paper, the effects of simple knee transfer (constant interproximal angle) growth break folds and faulting folds, wing rotation (constant wing length) slippage fold, knee flexion and extrusion slippage, knee flexure-wing rotation synergy and arc bending According to the geometric structure of the river terraces under the action of the fold-fold belt in the junction of the kurtosis and the angle between the terrace and the underlying basement rock, a kinematical model of the relationship between these folds and the river terraces is proposed. At the same time, Influence of Undercut Erosion on Final Geometry Structure of River Terraces. In these models, the basic geometry of deformed river terraces and folded scarps has both similarities and completely different features. Therefore, the detailed mapping, dating and dating of the river terraces and crevasses can not only infer the growth and deformation mechanism of the underlying active folds, but also estimate the fold uplift rate and the slip rate of faults controlling the fold growth .